Dolostone is designated the official State rock of the State of Illinois.
5 ILCS 460/27
State rock
Known as the State Designations Act
The act spans §§ 5-460-1 to 5-460-95 (40 sections).
P.A. 102-1044, eff. 1-1-23.
Official source: Illinois General Assembly. Reproduced from public-domain Illinois statutes; confirm against the official source for the current text. Not legal advice.